| Title | Quality assessment of bed sediments of the Po River (Italy) |
| Abstract | Comprehensive and contemporary evaluations of physical, chemical and toxicological endpoints have been performed on bed sediments of the Po River, the major Italian watercourse. Two extensive sampling campaigns were conducted in summer and winter low-flow conditions. Composite sediment samples were collected from ten reaches of the main river: the first was located in the upper region (ambient control), and the others downstream of the confluences of nine principal tributaries. The two sampling programs were paralleled by contemporary investigations on the macroinvertebrate community. The particle-size composition along the Po River showed a relatively uniform distribution of fine sand, a progressive downstream decrease of coarse sands and a corresponding increase of fine materials. The levels of polychlorinated biphenyls (PCB), polycyclic aromatic hydrocarbons (PAH), extractable organo halides (EOX), Cd, Cr, Cu, Hg, Ni, Pb and Zn were determined in sediment fine particles (<63?m), and showed marked changes across the ten river reaches. Their longitudinal trends, as those of organic carbon and total nitrogen, were very similar and largely independent of the survey season. Sediment quality benchmarks were used to evaluate sediment chemistry, and, although the overall level of contamination was from moderate to low, the reaches located downstream of the tributaries Dora Riparia, Dora Baltea, Lambro and Oglio were considered to be at risk. Sediments were tested for toxicity on Oncorhynchus mykiss, Ceriodaphnia dubia, Raphidocelis subcapitata and Vibrio fischeri. The toxicity tests were conducted both with sediment extracts and whole samples. Sediment extracts showed toxic potentials that were consistent with the spatial distribution of contaminants. Whole-sediment toxicity showed moderate/low effects which also included false positives and negatives. Alterations of the macroinvertebrate community were found for many kilometers downstream of Dora Riparia, and with a seasonal dependence, also in other reaches of the Italian river. Principal component analysis (PCA) was used to describe the longitudinal and temporal changes of the Po River, and allowed the selection of the most useful and discriminating indicators. © 2002 Elsevier Science Ltd. All rights reserved. |
| Source | Water research (Oxf.) 37 (3), pp. 501–518 |
| Keywords | MacroinvertebratesPo RiverSediment chemistrySediment quality assessmentSediment toxicity |
| Journal | Water research (Oxf.) |
| Editor | Pergamon Press., New York, Regno Unito |
| Year | 2003 |
| Type | Articolo in rivista |
| DOI | 10.1016/S0043-1354(02)00109-4 |
| Authors | Viganò, Luigi; Arillo, Attilio; Buffagni, Andrea; Camusso, Marina; Ciannarella, Ruggero; Crosa, Giuseppe; Falugi, Carla; Galassi, Silvana; Guzzella, Licia; Lopez, Antonio; Mingazzini, Marina; Pagnotta, Romano; Patrolecco, Luisa; Tartari, Gianni; Valsecchi, Sara |
| Text | 339363 2003 10.1016/S0043 1354 02 00109 4 Scopus 2 s2.0 18744372993 Macroinvertebrates Po River Sediment chemistry Sediment quality assessment Sediment toxicity Quality assessment of bed sediments of the Po River Italy Vigano, Luigi; Arillo, Attilio; Buffagni, Andrea; Camusso, Marina; Ciannarella, Ruggero; Crosa, Giuseppe; Falugi, Carla; Galassi, Silvana; Guzzella, Licia; Lopez, Antonio; Mingazzini, Marina; Pagnotta, Romano; Patrolecco, Luisa; Tartari, Gianni; Valsecchi, Sara Istituto di Ricerca sulle Acque, Italy; Universita degli Studi di Genova; Istituto di Ricerca sulle Acque, Italy; Universita degli Studi di Milano; Universita degli Studi di Genova; Universita degli Studi di Milano; Istituto di Ricerca sulle Acque, Italy Comprehensive and contemporary evaluations of physical, chemical and toxicological endpoints have been performed on bed sediments of the Po River, the major Italian watercourse. Two extensive sampling campaigns were conducted in summer and winter low flow conditions. Composite sediment samples were collected from ten reaches of the main river the first was located in the upper region ambient control , and the others downstream of the confluences of nine principal tributaries. The two sampling programs were paralleled by contemporary investigations on the macroinvertebrate community. The particle size composition along the Po River showed a relatively uniform distribution of fine sand, a progressive downstream decrease of coarse sands and a corresponding increase of fine materials. The levels of polychlorinated biphenyls PCB , polycyclic aromatic hydrocarbons PAH , extractable organo halides EOX , Cd, Cr, Cu, Hg, Ni, Pb and Zn were determined in sediment fine particles <63 m , and showed marked changes across the ten river reaches. Their longitudinal trends, as those of organic carbon and total nitrogen, were very similar and largely independent of the survey season. Sediment quality benchmarks were used to evaluate sediment chemistry, and, although the overall level of contamination was from moderate to low, the reaches located downstream of the tributaries Dora Riparia, Dora Baltea, Lambro and Oglio were considered to be at risk. Sediments were tested for toxicity on Oncorhynchus mykiss, Ceriodaphnia dubia, Raphidocelis subcapitata and Vibrio fischeri. The toxicity tests were conducted both with sediment extracts and whole samples. Sediment extracts showed toxic potentials that were consistent with the spatial distribution of contaminants. Whole sediment toxicity showed moderate/low effects which also included false positives and negatives. Alterations of the macroinvertebrate community were found for many kilometers downstream of Dora Riparia, and with a seasonal dependence, also in other reaches of the Italian river. Principal component analysis PCA was used to describe the longitudinal and temporal changes of the Po River, and allowed the selection of the most useful and discriminating indicators. © 2002 Elsevier Science Ltd. All rights reserved. 37 Published version http //www.scopus.com/record/display.url eid=2 s2.0 18744372993 origin=inward Articolo in rivista Pergamon Press. 0043 1354 Water research Oxf. Water research Oxf. Water res. Oxf. Water research. Oxf. liciamaria.guzzella GUZZELLA LICIA MARIA |
